TarMap is a utility for mapping the files in a tar archive without
having to unpack and write them to disk first. The output produced by
this utility is roughly equivalent to FTimes output produced with the
following FieldMask:

This utility was initially written to help determine if any files on a
system with no prior baseline had been changed. While the system in
question didnt have a baseline, it did have several tar ball backups.
The main issue was that the backups were so large that extracting them
to temporary storage first would have been impractical. This utility,
allowed us to avoid that issue by directly processing an uncompressed
stream of the backup (e.g., via gunzip or bunzip2).